You're in pre flower stage.
DLI and that. You need a good lux meter. And knowledge. And if you're asking this. Then you really don't need to be getting into it
Until u understand 101s. How to bring a plant through different stages. DLI and fine running will come. Shit im still fine tunning 3yrs in. Different phenos require different stuff.
With that being a full gal. 16-17 hrs of light. 5-700 ppfd (keep 45 distance) as you're still in a growing phase. So, you want it to keep progressing. When the stretch (pre flower) has stopped u can give 1000ppfd canopy wide. Move to 30cm and push through with sugars and good pk boosters for heavy flowering. Don't let the soil substrate dry up in pre flower. Don't defol.
Feel free 2dm me if u want expansion on what's said. She Is looking good. So, as she comes into pre flower. Just be much more careful when feeding as it gets very sensitive at that stage.
Good luck.